Van Heerden, Cornelius Hendrik, 1957-; Van Heerden, Neels, 1957-(Africa Association for Health, Physical Education, Recreation, Sport and Dance, 2005-09)
Van Heerden, Neels, 1957-; Van Heerden, Cornelius Hendrik, 1957-; Schreuder, A.N.; Gouverneur, M.(Faculty of Economic and Management Sciences, University of Pretoria, 2000-03)
Wiese, Melanie; Van Heerden, Cornelius Hendrik, 1957-; Jordaan, Yolanda; North, Ernest J.(College of Economic and Management Sciences, University of South Africa, 2009-04)